How useful is this? If your military is psi-heavy and you've been itching to give a rival faction a good drubbing, here's your chance. If not, the psi attack bonus also applies to regular units attacking wild or enemy-controlled native units. If there's a possibility you'll be on hostile terms with the Gaia's Stepdaughters (Green) faction, it's excellent defensive thinking to build it just so they can't. I consider native units somewhat pricey for what they do, and this Project moves their cost-effectiveness more in line with non-native forces.